Yem is one of the woredas in the Southern Nations, Nationalities, and Peoples' Region (SNNPR) of Ethiopia. Because Yem is not part of any Zone in the SNNPR, it is considered a Special woreda, an administrative subdivision which is similar to an autonomous area. Yem is named for the Yem, or Janjero, people whose homeland lies in this special woreda (see Kingdom of Janjero). Yem is bordered on the west and north by the Oromia Region, and separated from Gurage on the northeast and Hadiya on the east by the Omo River. High points in Yem include Mount Bor Ama, Mount Azulu and Mount Toba. The administrative center of Yem is Fofa.
The form of subsistence agriculture practiced in this woreda is based on cereal and enset. Important cash crops include teff, wheat, barley and pulses. Other important non-agricultural sources of income include selling butter and remittances. According to a 2004 report, Yem had 12 kilometers of asphalt roads, 11 kilometers of all-weather roads and 31 kilometers of dry-weather roads, for an average road density of 81 kilometers per 1,000 square kilometers.
Based on the 2007 Census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 80,687, of whom 40,566 are men and 40,121 women; with an area of 647.90 square kilometers, Yem has a population density of 124.54. While 7,952 or 9.86% are urban inhabitants, a further 106 or 0.13% are pastoralists. A total of 17,632 households were counted in this woreda, which results in an average of 4.58 persons to a household, and 17,204 housing units. The three most numerous ethnic groups reported in this woreda were the Yem (90.57%), the Oromo (5.41%), and the Hadiya (1.27%); all other ethnic groups made up 2.75% of the population. Yemsa was spoken as a first language by 72.67% of the inhabitants, 22.63% spoke Oromiffa, 2.57% spoke Amharic, and 1.16% spoke Hadiya; the remaining 0.97% spoke all other primary languages reported. 63.05% of the population said they practiced Ethiopian Orthodox Christianity, 27.09% were Muslim, and 9.61% were Protestants.